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Vishay General Semiconductor - Diodes Division SMBJ24A-E3/5B
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- Part No.:
- SMBJ24A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24A-E3/5B.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,456
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Product details
Overview
SMBJ24A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 24 V stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, 38.9 V maximum clamping voltage (VC) at 15.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ24A-E3/5B datasheet, SMBJ24A-E3/5B pinout, SMBJ24A-E3/5B application, or SMBJ24A-E3/5B equivalent, key selection criteria include clamping performance under 15.4 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity with cathode band marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 24 V, it avalanches into low-impedance conduction to divert transient energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), critical for suppressing sub-microsecond ESD events per IEC 61000-4-2.
The device is rated for repetitive 600 W pulses (10/1000 µs, 0.01% duty cycle) on 5.0 mm × 5.0 mm copper pads, with maximum junction temperature of +150 °C and storage range from –55 °C to +150 °C. Its low incremental surge resistance enables effective clamping even under high-current transients, while MSL Level 1 moisture sensitivity supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - Maximum continuous reverse operating voltage before significant leakage; defines circuit's normal operating margin. |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system rail. |
| VC (Clamping Voltage) | 38.9 V at IPPM = 15.4 A - Peak voltage seen by protected load during 10/1000 µs surge; determines safe overvoltage margin. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy handling capability under standardized 10/1000 µs waveform. |
| IPPM (Peak Pulse Current) | 15.4 A - Maximum non-repetitive surge current the device can safely clamp without degradation. |
| RθJA (Junction-to-Ambient) | 100 °C/W - Thermal resistance defining temperature rise per watt dissipated; guides heatsinking and layout design. |
| TJmax | +150 °C - Absolute maximum junction temperature; sets upper limit for ambient + self-heating in continuous operation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by a band on the body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode (unbanded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping current loop. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against industrial-level lightning surges and inductive kickback without derating. |
| 38.9 V clamping at 15.4 A | Provides tight overvoltage control for 24 V systems-keeps downstream logic/MOSFETs within safe absolute maximum ratings. |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage (<1 µA at VWM), critical for battery-powered or low-power sensor interfaces. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without pre-baking; compatible with high-volume automated manufacturing. |
| RoHS-compliant, halogen-free option available | Meets global environmental compliance requirements (base P/N-E3); suitable for consumer, industrial, and automotive supply chains. |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting gate drivers and microcontroller I/O lines from inductive flyback spikes generated by relay or solenoid switching in factory automation panels. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly across protected signal or power rail, clamping voltage within 100 ns of surge onset. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic inputs and 24 V-rated MOSFET gate oxide by limiting transient excursion to ≤38.9 V. |
Use Scenario: Safeguarding LIN bus transceivers and sensor signal conditioning circuits from load dump and jump-start transients in vehicle body electronics. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and chassis ground, activated only during positive-going overvoltage events. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 1/2a/5a tests by clamping 24 V rail excursions to <40 V, preserving communication uptime. |
| Industrial Ethernet PHY Interface | Smart Energy Meter Sensor Inputs |
|
Use Scenario: Shielding RJ45 magnetics secondary side and PHY IC pins from ESD and fast-rising surges induced by nearby AC wiring or relay switching. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF typical at 0 V) placed adjacent to PHY input pins to minimize signal distortion. Use Value: Limits ESD-induced voltage overshoot to <40 V while maintaining Ethernet signal rise/fall times and insertion loss compliance. |
Use Scenario: Protecting analog front-end (AFE) inputs of current/voltage sensing circuits in revenue-grade electricity meters exposed to grid transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on shunt resistor measurement nodes, absorbing energy from metering transformer coupling or neutral faults. Use Value: Ensures measurement accuracy remains intact after repeated 1 kV/µs transients by preventing AFE saturation or ADC input damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA-E3/5B | Bidirectional variant; symmetric VBR (26.7–29.5 V) in both polarities; no polarity marking. | Required for AC-coupled or differential signal lines (e.g., RS-485, CAN) where negative transients must also be clamped. | Select SMBJ24CA-E3/5B only if bidirectional protection is needed; SMBJ24A-E3/5B is optimal for DC rails with defined ground reference. |
| SMCJ24A-E3/57T | Larger SMC (DO-214AB) package; higher PPPM = 1500 W; same VWM/VC specs but lower RθJA = 50 °C/W. | Suitable for higher-energy surge environments (e.g., outdoor telecom cabinets) where 600 W is insufficient. | Choose SMCJ24A-E3/57T when surge threat level exceeds IEC 61000-4-5 Level 4; SMBJ24A-E3/5B fits space-constrained 24 V control boards. |
Compared with SMBJ24CA-E3/5B and SMCJ24A-E3/57T, SMBJ24A-E3/5B delivers optimal balance of compact SMB footprint, 600 W surge capacity, and precise 24 V system compatibility-making it ideal for cost-sensitive, space-limited industrial and automotive control modules requiring unidirectional clamping.
Availability
SMBJ24A-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and smart energy meter designs requiring stable component supply, RoHS compliance, and repeatable surge immunity performance.
Supply support for SMBJ24A-E3/5B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series was engineered for high-reliability transient suppression in harsh industrial and automotive environments, targeting 24 V and 48 V systems where consistent clamping, low leakage, and automated assembly compatibility are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ24A-E3/5B under a 10/1000 µs surge?
The SMBJ24A-E3/5B has a maximum clamping voltage (VC) of 38.9 V at 15.4 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the highest voltage the protected circuit will experience during a full-rated transient event. The SMBJ24A-E3/5B maintains this clamping performance across its specified operating temperature range.
Is SMBJ24A-E3/5B suitable for automotive applications?
SMBJ24A-E3/5B is RoHS-compliant and qualified to MSL Level 1, but it is not AEC-Q101 certified in this specific suffix. For automotive use, Vishay offers the AEC-Q101-qualified variant SMBJ24AHE3_B/I (with HE3 suffix). The SMBJ24A-E3/5B remains appropriate for non-safety-critical automotive subsystems like infotainment power rails or cabin sensors where formal qualification is not mandated-always verify compliance requirements against your vehicle platform's specifications before using SMBJ24A-E3/5B.
How does the SMBJ24A-E3/5B differ from the SMBJ24CA-E3/5B?
The SMBJ24A-E3/5B is unidirectional, with a cathode band indicating polarity and clamping only positive transients relative to ground. The SMBJ24CA-E3/5B is bidirectional, offering symmetrical clamping for both positive and negative excursions-ideal for AC signals or differential buses. Both share identical VWM (24 V), VBR, and PPPM (600 W), but the SMBJ24A-E3/5B provides lower capacitance and simpler layout for DC-coupled 24 V systems.
What is the thermal resistance of SMBJ24A-E3/5B, and how does it affect PCB layout?
The SMBJ24A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding thermal vias reduces RθJA. For sustained surge duty or elevated ambient temperatures, designers should verify junction temperature stays below +150 °C using SMBJ24A-E3/5B's power dissipation limits and actual board layout.
Can SMBJ24A-E3/5B replace P6KE24A in an existing design?
SMBJ24A-E3/5B is not a direct drop-in replacement for through-hole P6KE24A due to different package (SMB vs. DO-15), thermal profile, and mounting method. While both have similar VWM (24 V) and PPPM (600 W), the SMBJ24A-E3/5B offers superior surge current density and automated assembly compatibility. To migrate, redesign PCB pads to SMB footprint, verify clamping behavior under identical test conditions, and confirm mechanical clearance-SMBJ24A-E3/5B cannot be substituted without layout changes.
SMBJ24A-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ24A-E3/5B FAQ
1.How can I place an order for SMBJ24A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24A-E3/5B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMBJ24A-E3/5B reliable?
The price and inventory of SMBJ24A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ24A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24A-E3/5B?
SMBJ24A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24A-E3/5B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMBJ24A-E3/5B?
For technical support, including SMBJ24A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24A-E3/5B requirements.
6.How does Aetrix verify that SMBJ24A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ24A-E3/5B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMBJ24A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ24A-E3/5B?
All SMBJ24A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24A-E3/5B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMBJ24A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ24A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24A-E3/5B Tags
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